stage0: use rootfs image permissions with overlay
stage0: use rootfs image permissions with overlay

When we use overlay, the permissions that end up in "rootfs/" are the
ones in the upper directory. To fix it, we need to set them as they are
in the image.

intelsdi-x/rkt,coreos/rkt,Wilybald/rkt,joshix/rkt,squeed/rkt,jzelinskie/rkt,jasonchaffee/rkt,matthaias/rkt,markllama/rkt,kinvolk/rkt,coreos/rkt,dgonyeo/rkt,euank/rkt,monstermunchkin/rkt,Shashwatsh/rkt,jjlakis/rkt,achanda/rkt,euank/rkt,tmrts/rkt,squeed/rkt,intelsdi-x/rkt,jasonchaffee/rkt,matthaias/rkt,rkt/rkt,yifan-gu/rkt,jasonchaffee/rkt,alban/rkt,nhlfr/rkt,s-urbaniak/rkt,shobhit85/rkt,liugenping/rkt,matthaias/rkt,mike1729/rkt,il9ue/rkt,markllama/rkt,blixtra/rkt,nhlfr/rkt,cab105/rkt,endocode/rkt,joshix/rkt,yifan-gu/rocket,lucasallan/rkt,shobhit85/rkt,sstabellini/rkt,yifan-gu/rkt,coreos/rkt,tmrts/rkt,sinfomicien/rkt,ybubnov/rkt,nhlfr/rkt,jakon89/rkt,shobhit85/rkt,jakon89/rkt,rkt/rkt,kinvolk/rkt,linki/rkt,akshaykarle/rkt,Wilybald/rkt,intelsdi-x/rkt,il9ue/rkt,cab105/rkt,achanda/rkt,monstermunchkin/rkt,sstabellini/rkt,dgonyeo/rkt,lucasallan/rkt,joshix/rkt,euank/rkt,jonboulle/rkt,yifan-gu/rocket,markllama/rkt,adfernandes/rkt,liugenping/rkt,Wilybald/rkt,blixtra/rkt,sgotti/rkt,squeed/rkt,rkt/rkt,krnowak/rkt,joshix/rkt,jjlakis/rkt,jzelinskie/rkt,kbrwn/rkt,kbrwn/rkt,kinvolk/rkt,blixtra/rkt,lucasallan/rkt,il9ue/rkt,adfernandes/rkt,jakon89/rkt,akshaykarle/rkt,jjlakis/rkt,achanda/rkt,sinfomicien/rkt,jonboulle/rkt,s-urbaniak/rkt,tmrts/rkt,rkt/rkt,yifan-gu/rocket,akshaykarle/rkt,liugenping/rkt,sinfomicien/rkt,endocode/rkt,Shashwatsh/rkt,lucasallan/rkt,ybubnov/rkt,sgotti/rkt,yifan-gu/rkt,Shashwatsh/rkt,dgonyeo/rkt,s-urbaniak/rkt,jzelinskie/rkt,alban/rkt,jonboulle/rkt,mike1729/rkt,mike1729/rkt,sstabellini/rkt,monstermunchkin/rkt,Wilybald/rkt,kbrwn/rkt,linki/rkt,adfernandes/rkt,alban/rkt,krnowak/rkt,ybubnov/rkt,kinvolk/rkt,sgotti/rkt,cab105/rkt,linki/rkt,krnowak/rkt,endocode/rkt